Mold for making building-tile



L. H. DE FERNELMO N T. MOLDIFIOR-MAKING BUILDING TILE.

APPLICATION FILED MAY 8| 191B 4 Patented June 1, 1920.

UNITED STATES PATNT OFFICE.

MOLD FOR MAKING. BUILDING-TILE.

Specification of Letters Patent.

Patented June 1, 1920.

Application filed May 8, 1918. Serial No. 233,218.

[0 all whom it may concern:

hollow building tiles, more especially for the construction ofpartitions or walls for interior work, the form of the tile being suchthat it shall provide continuous ventilating apertures extending inparallel relation through the finished wall, and said apertures soformed as to break up the sound waves in such manner that the wall willbecome substantially sound-proof against the transmission of articulatespeech, the said wall requiring only a relatively small thickness andthereby resulting in economy in material.

My invention has for a further object the construction of the mold ofparts detach? ably assembled which enables the cores, which mold thehollow passages through the tile, to be withdrawn freely from theplaster material when set, and thereafter the separation of therectangular frame on diagonally opposite corners to release the moldedplaster.v

My invention consists of a rectangular frame formed of two right-angledframes detachably connected on diagonally opposite corners, one of saidright-angled frames formed with a deep groove along its inner edges, andthe other of said right-angled frames formed with ribs along its inneredges, said rectangular frame combined with a plurality of parallelcores extending through apertures formed in opposed grooved and ribbedwalls of the two rightangled frames, said cores adapted to be withdrawnlongitudinally without dismantling the rectangular frame. I

My invention further consists in having the aforesaid cores tapered andat the smaller end said taper abruptly reduced and continued in anextended portion of greatly less diameter, said reduced portion arrangedadjacent to the grooved inner edge of the rectangular frame. v

My invention also comprehends details of construction, which, togetherwith the tea tures above specified, are more fully de scribedhereinafter and particularly pointed out in the claims;

My invention will be better understood by references to the drawings, inwhich Figure 1 is a plan View of the mold in completed form ready foruse; Fig. 2, is a section; thereof taken on line 22; Fig. 3 is a sectionthereof taken on line 33; Fig. 4 is an elevation of one of thecoresremoved; Fig. 5 is a perspective view of a portion of one of theright-angled frames which make up the rectangular frame; Fig. 6 is avertical section through a portion of a wall composed of the hollowtiles molded by use of my improved mold, and Fig. 7" is a perspectiveview of one of the tiles which may be molded by my improved moldingapparatus.

2 and 3 are opposite bars or sides of the mold, bar 2 being grooved asat 13 and'bar 3 being ribbed as at 10. Similarly, 4 and 5 are oppositebars or sides of the mold and are respectively grooved at 1.3 and ribbedat 10 as in the case of bars 2 and 3. The two grooved bars 2 and 4 aresecured together at 7 to form a right-angled frame forming one-half ofthe mold frame proper;

and similarly, the two ribbed bars 3 and 5 are secured together at 6 toform a rightangled frame forming the other half of the mold frameproper. These two right-angled frames are then placed in contact to forma rectangular frame and the diagonally arranged corners are detachablyclamped by screws 8 and 9, respectively. The free ends of the tworectangular frames are suitably shaped so that they snugly fit inpairsand when secured together by the screws 8 and 9, the frame is quiterigid.

The general cross section of bars 2 and 4 are the same and similarly thegeneral cross section of bars 3 and 5 are the same; and the rib portions10 are of a shape which would fit into the grooves 13 so that when theyact tomold the plaster the abutting edges of adjacent tiles interengageas indicated in Fig. 6. The side walls 11 of the ribs 10 are oppositelyinclined and similarly the side walls'14 of the grooves 13 areoppositelyinclined and the flare or taper in the two cases is reversed so as topermit easy withdrawal of the mold parts from the plaster, as will bereadily understood byreference to Fig. 3. The thicknessofthebars 2, 3, 4and 5 is uniform so as toprovide an even thickness to the molded tileand the an upper guide surface for guiding the wiping tool in the act ofmolding the tile.

The opposite bars 2 and '3 are respectively provided with holes 19 and20 for receiving the cores 16 which are employed to mold the parallelapertures 22 (Fig. 6) through thetile 21 formed by use of the mold.These cores 16 are tapered and made hollon for lightness, and at thesmaller end of the core it is shouldered as at 18 and provided beyondthe shoulder with the slightly tapered extension 17 of relatively smalldiameter. It will be understood that the grooved wall of the bar 2 isformed with small tapered apertures 19, whereas the ribbed portion ofthe opposite bar 3 is provided with large tapered'apertures 20. Thecores fit through these apertures 19 and 20 very snugly, so asto make aclean molded tile. In the case of the large ends of the cores 16 theyare preferably of a diameter which just equals the greatest width at thebase of the rib 10, as will be understoodby reference to Figs. 2, 3 and5, while in the case of the smallends of the cores 17 thereof areconsiderably less in diameter thanthe width of the groove, so as topermit a continuous rib of plaster to be molded as shown in Fig. 7 andfurthermore, to provide shouldered apertures 27 in the tile to break upthe sound vibrations, as more fully described hereinafter.

An important feature in the shape of the,

bars 2,. 3, 4 and 5, resides in the inclined 1 side flanges 12, which inthe assembled mold,

provide undercut portions adapted to producebeveled shoulders 24 and 25in the tile itself (Figs. 6 and 7). These beveled shoulders 24 and 25 inadjacent tiles, when assembled, provide-V shaped channels, which aresubsequently filled with plaster as at 28, Fig. 6, to'form a smoothcontinuous wall. The tapered ribs 23 of one tile snugly fit the taperedor flaring groove 13 (Figs. 6 and 7) in the adjacent tile, so that theassembled tiles constituting the wall are firmly positioned. andinterlocked by .reason of the shapes ofthe groovesand ribs formed bythermold.v

It will be observed that while the two 1"ightangled frames of the moldare held together by the clamping screws 8 and 9, the

tapered cores 16 may be avitlicli'zuvn from the molded plaster, therectangular mold frame holding the plaster, against distortion orcracking during this operation. If the cores should bind they may beloosened by slight pressure on the ends 17 or by slight rotation andpulling on the large end. The cores may beslightly greased if so desiredto facilitatetheir removal, but being-tapered from one end to the other,they may be readily withdrawn, once they are started.

After the Withdrawal ofthe cores and sufficient setting or hardening ofthe plaster, the clamping screws 8 and 9 maybe withdrawn andtheright-angled frames released and separated from the edges of themolded tile. These frames being of right-angled construction are each ineffect. V shaped in their contact with the bounding edges of the tileand hence readily removable without.

danger of injuring the plaster. It will be noted that every part of themold which contacts with the plaster is tapered or beveled so as to befreely removable and hence a perfectmolded tile is possible. Thefactthat cores are independently removable from.

the rectangular frame is most important,

and this is further enhanced by reason of,

the fact that the several cores arealso independently removable, all ofwhichfacilitates i the liberation of the molded tile and hence reducesthe danger of breakage-thereof.

As before stated, the shape of the tile V such that it is provided witha plurality of parallel apertures 22, choked at one end by theshouldered portions formed in therib 23 and through which the aperturesare continued in small ,holes 27. The advantage of this resides inprovidingventilating apertures which provide dryness and atthe same.

time so shaping the apertures that they are bad conductors of sound byreason of. the:

shown in Figs. 6 and 7 is desirable between apartments and oflices.

I do notrestrict myself to any particular character of plaster materialfrom which to mold thetiles, as any suitable material here. tofore inuse may be employed, but the improved tile shall have its edges partlygrooved and partly ribbed with flaring or inclined shoulders at eachside of the grooves and ribs, and further providedwith a plu-.

rality of parallel tapered apertureshaving shouldered and contractedpassages at one endwhere they extend into one ofthe ribbed edges. Inthis application I make no claim to the tile as an article ofmanufacturenor to the wall composed of such tiles, nor to the method. offorming the wall with the said tiles, as these form subject matter of adivisional application Serial Number,

293,599, filed April 80th, 1919.

It will now be apparent that I have devised a novel and usefulconstruction which embodies the features of advantage enumerated asdesirable, and while I have inthe,

present instance shown. anddescribed the:

preferred embodiment thereof which has been found in practice to givesatisfactory and reliable results, it is to be understood that I do notrestrict myself to the details, as the same are susceptible ofmodification in various particulars without departing from the spirit orscope of the invention.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A mold for molding wall tiles, comprising two right-angled frames oneof which has its inner face grooved and the other of which has its innerface ribbed and of the same general cross section as the grooves, andthe bounding flanges on each side of the ribs and grooves made flaringin opposite directions, the flare of said flanges at each side of themold being such that if continued they would intersect at substantiallya common point, means for detachably clamping the two frames together toform a rectangular mold frame separable into two parts at diagonallyopposite corners, and a plurality of tapered cores extending entirelyacross the mold frame, the large ends of the cores seated in the ribs ofone of the right-angled frames and the small ends of the cores seated inthe bottom of the groove of the other right-angled frame, said coresremovable longitudinally without separating the mold frame.

2. A mold for molding wall tiles, comprising two right-angled frames oneof which has its inner face grooved and the other of which has its innerface ribbed and of the same general cross section as the grooves, andthe bounding flanges on each side of the ribs and grooves made flaringin opposite directions, the flare of said flanges at each side of themold being such that if continued they would intersect at substantiallya common point, means for detachably clamping the two frames together toform a rectangular mold frame separable into two parts at diagonallyopposite corners, and a plurality of tapered cores extending entirelyacross the mold frame, the large ends of the cores seated in andextending through the ribs and bar of one of the right-angled frames andthe small ends of the-cores provided with shoulders and extensions ofstill smaller diameter seated in and extending through the bottom ofthegroove and bar of the otherrightangled frame, said cores throughouttheir 1 length being circular in cross section and adapted to berotatable upon their axes and removable longitudinally withoutseparating the mold frame.

3. A mold comprising a rectangularframe open at its top and bottom andformed of two right-angled frames detachably connected on diagonallyopposite corners, one of said right-angled frames formed with a deepgroove along its inner edges and the other of said right-angled framesformed with a rib along its inner edges, combined with a plurality ofparallel tapered cores having straight axes and extending throughapertures formed in opposed grooved and ribbed walls of the tworight-angled frames,

said cores throughout their length being circular in cross section andadapted to be rotated while being withdrawn longitudinally withoutdismantling the rectangular frame;

4:. A mold comprising a rectangular frame open at its sides anddetachably connected on its corners for easy separation and removal fromthe molded object in two right angled parts, one of said parts havingbars formed with a deep groove with flaring walls terminating in flangeportions also tapered with greater flare and the other-of said partshaving bars formed with a rib with inclined walls and flange portionsalso inclined to flare in opposite directions, combined with a pluralityof tapered cores having their large ends extending through the rib ofone of the mold parts and its small end extending through the bar havingthe groove of the other mold part, the'said cores removable in thedirection of their length without separating the two parts of therectangular mold frame.

5. A removable core for a mold consisting of a long straight body oftapered form iaving solid smooth walls and also having its end ofsmaller diameter abruptly reduced in diameter by a bluntly taperedcone-like portion and continued in a short extension of relatively smalldiameter beyond the cone- Y like portion, and in which the corethroughout its length is circular in cross section so that it may berotated'within the molded mass when. being withdrawn.

In testimony of which invention, I hereunto set my hand.

LEONARD H. DE FERNELMONT,

